Meaning of subtract

sub•tract

Pronunciation: (sub-trakt'), [key]
— v.t.
  1. to withdraw or take away, as a part from a whole.
  2. to take (one number or quantity) from another; deduct.
—v.i.
  1. to take away something or a part, as from a whole.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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